. Motori a vapore, una presentazione completa e pratica della pratica moderna dei motori a vapore. Migliore possibilità di buttare attraverso. Al fine di pre-sfiatare questo, i giunti sono alisposti sui lati opposti delpistone. Gli anelli di impacchettamento sono realizzati in ghisa, e sono usualmente girati fino ad un sec-tion uniforme. La parte esterna e i due lati sono lavorati con cura. Pistoni. Il pistone 2, Pig.8, è solitamente realizzato in ghisa, ma talvolta in acciaio fuso. ? Può trattarsi di un disco pieno scanalato, come in Pig. 9, o la porzione centrale può essere intorata, come in Pig. 8. Un altro tipo di pistone che è ampiamente utilizzato

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. Steam engines, a thorough and practical presentation of modern steam engine practice . better chance toblow through. In order to pre-vent this the joints are alwaysplaced on opposite sides of thepiston. Packing rings are alwaysmade of cast iron, and are usu-ally turned up to a uniform sec-tion. The outside portion and the two sides are carefully machined. Pistons. The piston 2, Pig.8, is usually made of cast iron, but sometimes is made of cast steel. ? It may be a solid disk grooved, as in Pig. 9, or the central portion may be cored out, as in Pig. 8. Another type of piston that is largely used in marine and some-times locomotive service is illustrated in Pig. 10. This is a com-paratively light cast steel piston, but at the same time a very strongone, due to its conical construction. It will be noted also that onlythe one packing ring 1 is used. This packing ring is much widerthan the ordinary snap ring and is pressed out against the cylinderwall by a number of single leaf springs being placed between thebody of the piston and packing ring, as shown in Pig. 10 at 2. The. Fig. 10 Part Section Plan and Elevationof Conical Piston .14 STEAM ENGINES piston is made with an L-shaped edge 3, a band 4 being bolted on theopen side of the L, thus forming a groove or opening for the recep-tion of the small springs and the packing ring. The connection ofthe piston rod to the piston is also clearly shown. The rod 5 hasa tapered end which is forced by hydraulic pressure into a taperedhole in the piston; the nut 7 is then tightened up an, d locked byplacing the plate in position around the nut and fastening it withcap screws. This arrangement insures a lasting connection betweenthe piston and the piston rod. It is essential that the piston be as light as possible in order toreduce the amount of work absorbed in pulling it to and fro, - andalso to reduce the wear on the lower portion of the cylinder. The piston rod 3, Fig. 9, is fitted into a tapered hole in the pis^ton and secured by

Parole chiave associate all'immagine

• bookcentury1900
• bookdecade1920
• booksubjectsteamen
• bookyear1920